微乳液法制备Fe_3O_4/TiO_2磁性纳米粒子

Preparation of Fe_3O_4/TiO_2 nanoparticles by microemulsion

采用多元醇还原法制备出平均粒径为6.0 nm的Fe3O4磁性纳米粒子,以此磁性纳米粒子为核,在OP-10/正丁醇/环己烷/浓氨水反向微乳体系中制备出Fe3O4/TiO2磁性纳米复合粒子,通过XRD,TEM,VSM对复合粒子进行性能表征。结果表明,采用微乳液法能够制备出Fe3O4/TiO2磁性纳米复合粒子,并且包覆后比饱和磁化强度有所下降,但矫顽力仍趋近于0,显示超顺磁性。

The Fe3O4 magnetic nanoparticles with the average particle size of about 6.0 nm were prepared by a polyol reduction method.Fe3O4/TiO2 nanoparticles were synthesized in a OP-10/n-butanol/cyclohexane/ammonia reverse microemulsion system by using of as-prepared Fe3O4 nanoparticles as cores.The composite nanoparticles were characterized by X-ray powder diffraction（XRD）,transmission electron microscopy（TEM）,and vibrating sample magnetometer（VSM）.The results showed that the primary titanium dioxide coated successfully on the surface of Fe3O4 nanoparticles.After coating performance,their saturation magnetization decreased significantly,while their coercivity was also close to zero indicating superparamagnetic properties.